Police stopped a man on Lower Temple Street in the centre of Birmingham around 11am.

The man was questioned by detectives and released before 12pm.

Police are now hunting a black man aged in his late teens or early twenties. He may have a bandage on his hand and may be carrying a holdall. His jacket may have a tiger motif on the back, police said.

Police have released this picture of the Birmingham bus stab victim. She has been named as 16-year-old Christina Edkins, a pupil at Leasowes High School in Halesowen

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13.18 Man arrested by police in hunt for killer of schoolgirl Christina Edkins

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13.12 The girl who died has been named as Christina Edkins and attended Leasowes High School in Halesowen

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12.47 Girl stabbed to death on bus has been named on Twitter as Kristina

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Crime scene investigators and forensic teams examine the bus where a 16-year-old girl was stabbed to death at 7.30am.

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Detective Superintendent Richard Baker: "This is a tragic case and the victim’s family are devastated. Few of us can imagine what they are going through and we are working hard to indentify the offender which involves speaking to a large number of people who witnessed the attack"

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Police say suspect is believed to be wearing a jacket with a tiger motif on the back. He is also believed to be carrying a holdall. He is black and in his late teens/early 20s. He should not be approached. If you see the man call police on 101.

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The Hagley Road has now reopened

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Press Association: Police have launched a manhunt for a black male in his late teens or early 20s after a 16-year-old schoolgirl was stabbed to death on a bus in Birmingham today. A suspect who was detained earlier has now been released, West Midlands Police said.

Amy Kiernan, who was passing through the area this morning, tweeted: "Lots of police cars & an ambulance just before Morrisons at Fiveways - causing a build up on the inbound side of the Hagley Road too."